Electric incandescent lamp



F. W. PETERSON.

ELECTRIC INCANDESCENT LAMP.

APPLICATION FILED FEB. 4, m9.

1,341,581 Patented May 25, 1920.

31402 vdoz Z fi fj eierson wit names FRANK WILLIAM PETERSON, OF PEORIA, ILLINOIS.

ELECTRIC INCANDESCENT LAMP.

Learner;

Application filed February 4,

To all whom it may concern:

Be it known that I, FRANK VVILLIAM PETERSON, a citizen of the United States, residing at Peoria, State of lllinois,have invented new and useful Improvements in Electric Incandescent Lamps, of which the following is a specification.

This invention has reference to improve ments in electric incandescent lamps, and the principal object of the invention is to provide means for renewing the filamentcarrying member when the original filament has been destroyed or for replacing said member by a similar member carrying filaments for giving a light of a different candle power. Another object of the invention is to provide the glass bulb with a screwthreaded end for receiving a metal cap, which is adaptedto fit in the ordinary receiving socket.

Another object is to provide a vacuum globe in which the filament is placed and which is provided with a receiving means with which engages a pair of supporting wires secured to the cap and acting as conductors for the current.

The invention also onsists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

Tn describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding Parts throughout the several views, and in which:

Figure 1 is a sectional view of the invention.

Fig. 2 is a view of the cap. Fig. 3 is a detailed view.

In these views, 1 indicates a glass bulb of,

the usual form but provided with a screwthreaded cylindrical end 2, which is open. This end is adapted to be closed by a screwthreaded cap 3, which is so formed as to fit the ordinary electric light socket. This cap Specification of Letters Patent.

1919 Serial No. sweat.

is made of any suitable material and is provided with the usual contacts. This cap has secured to its interior a pair of depending strips at, which are of sufiicient strength to support the filament-carrying bulb 5. This bulb is made of glass and contains the filament 6. The air is exhausted from this bulb in the usual manner. The end of this bulb carries a pair of contact posts 7, having their inner ends connected with the filament and these posts receive the free ends of the strips 4. The filament-carrying globe 5 is made small enough to pass within the neck or cylindrical part 2 of the main bulb, and

is supported in said bulb by the strips l. These strips 4 also act as conductors for the current. It will be understood that a vacuum must be formed in the globe or bulb 5 but it is not necessary to have a vacuum in the outer bulb.

It will thus be seen that when the filament '6 is burnt out or otherwise destroyed, the bulb 5 can easily be removed and replaced by a new one or said bulb may be replaced by a similar bulb to provide light of a different candle power.

What I claim is 1. An electric lamp of the class described, comprising a vacuum globe having a filament therein, an outer globe for containing the vacuum globe, said outer globe having a screw-threaded neck, a screw-threaded socket engaging cap engaging said neck and a pair of conductor strips connecting the cap with the vacuum globe.

2. An electriclamp of the class described comprising an outer globe shaped like an ordinary electric bulb, a cap removably attached to the neck of said globe and provided with screw-threads to engage anelectric light socket, a pair of conductor strips carried by the cap. and extending into the globe, a vacuum globe in said outer globe and means for detachably connecting the terminals of said vacuum globe to said strips.

Tn testimony whereof T afiix my signature.

FRANK WTLLTAM PETERSON. 

